linux-kernel - Re: [PATCH v4 1/2] backlight: ktz8866: Add support for Kinetic KTZ8866 backlight

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Message-ID: <Y8aq1aJd8QJCo3RU@aspen.lan>
Date:   Tue, 17 Jan 2023 14:04:05 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Jianhua Lu <lujianhua000@...il.com>
Cc:     Lee Jones <lee@...nel.org>, Jingoo Han <jingoohan1@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Helge Deller <deller@....de>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v4 1/2] backlight: ktz8866: Add support for Kinetic
 KTZ8866 backlight

On Tue, Jan 17, 2023 at 09:47:41PM +0800, Jianhua Lu wrote:
> Add support for Kinetic KTZ8866 backlight, which is used in
> Xiaomi tablet, Mi Pad 5 series. This driver lightly based on
> downstream implementation [1].
> [1] https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/elish-r-oss/drivers/video/backlight/ktz8866.c
>
> Signed-off-by: Jianhua Lu <lujianhua000@...il.com>
> ---
> Changes in v2:
>   - Add missing staitc modifier to ktz8866_write function.
>
> Changes in v3:
>   - Add 2022 to Copyright line.
>   - Sort headers.
>   - Remove meaningless comment.
>   - Use definitions instead of hardcoding.
>   - Add missing maintainer info.
>
> Changes in v4:
>   - Change 2022 to 2023.
>   - Remove useless macro and enum.
>   - Describe settings by devicetree.
>   - Move header file to C file.
>
>  MAINTAINERS                       |   6 +
>  drivers/video/backlight/Kconfig   |   8 ++
>  drivers/video/backlight/Makefile  |   1 +
>  drivers/video/backlight/ktz8866.c | 195 ++++++++++++++++++++++++++++++
>  4 files changed, 210 insertions(+)
>  create mode 100644 drivers/video/backlight/ktz8866.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 42fc47c6edfd..2084e74e1b58 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11674,6 +11674,12 @@ M:	John Hawley <warthog9@...lescrag.net>
>  S:	Maintained
>  F:	tools/testing/ktest
>
> +KTZ8866 BACKLIGHT DRIVER
> +M:	Jianhua Lu <lujianhua000@...il.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
> +F:	drivers/video/backlight/ktz8866.c
> +
>  L3MDEV
>  M:	David Ahern <dsahern@...nel.org>
>  L:	netdev@...r.kernel.org
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 936ba1e4d35e..2845fd7e33ad 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -190,6 +190,14 @@ config BACKLIGHT_KTD253
>  	  which is a 1-wire GPIO-controlled backlight found in some mobile
>  	  phones.
>
> +config BACKLIGHT_KTZ8866
> +	tristate "Backlight Driver for Kinetic KTZ8866"
> +	depends on I2C
> +	select REGMAP_I2C
> +	help
> +		Say Y to enabled the backlight driver for the Kinetic KTZ8866
> +		found in Xiaomi Mi Pad 5 series.
> +
>  config BACKLIGHT_LM3533
>  	tristate "Backlight Driver for LM3533"
>  	depends on MFD_LM3533
> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> index e815f3f1deff..f70a819c304c 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_BACKLIGHT_HP680)		+= hp680_bl.o
>  obj-$(CONFIG_BACKLIGHT_HP700)		+= jornada720_bl.o
>  obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO)	+= ipaq_micro_bl.o
>  obj-$(CONFIG_BACKLIGHT_KTD253)		+= ktd253-backlight.o
> +obj-$(CONFIG_BACKLIGHT_KTZ8866)		+= ktz8866.o
>  obj-$(CONFIG_BACKLIGHT_LM3533)		+= lm3533_bl.o
>  obj-$(CONFIG_BACKLIGHT_LM3630A)		+= lm3630a_bl.o
>  obj-$(CONFIG_BACKLIGHT_LM3639)		+= lm3639_bl.o
> diff --git a/drivers/video/backlight/ktz8866.c b/drivers/video/backlight/ktz8866.c
> new file mode 100644
> index 000000000000..98916f92d069
> --- /dev/null
> +++ b/drivers/video/backlight/ktz8866.c
> @@ -0,0 +1,195 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Backlight driver for the Kinetic KTZ8866
> + *
> + * Copyright (C) 2023 Jianhua Lu <lujianhua000@...il.com>

Shouldn't this be:
Copyright (C) 2022, 2023 Jianhua Lu <lujianhua000@...il.com>

> +static int ktz8866_probe(struct i2c_client *client,
> +			 const struct i2c_device_id *id)
> +{
> +	struct backlight_device *backlight_dev;
> +	struct backlight_properties props;
> +	struct ktz8866 *ktz;
> +
> +	ktz = devm_kzalloc(&client->dev, sizeof(*ktz), GFP_KERNEL);
> +	if (!ktz)
> +		return -ENOMEM;
> +
> +	ktz->client = client;
> +	ktz->regmap = devm_regmap_init_i2c(client, &ktz8866_regmap_config);
> +
> +	if (IS_ERR(ktz->regmap)) {
> +		dev_err(&client->dev, "failed to init regmap\n");
> +		return PTR_ERR(ktz->regmap);
> +	}
> +
> +	memset(&props, 0, sizeof(props));
> +	props.type = BACKLIGHT_RAW;
> +	props.max_brightness = MAX_BRIGHTNESS;
> +	props.brightness = DEFAULT_BRIGHTNESS;

There is still pending feedback from v3.

| Please set the scale property correctly. "Unknown" is never correct for
| new drivers.

Do not ignore feedback. You should either act on it or, if you disagree
or need additional clarification then, reply on the mail thread.


Daniel.